Ruby on rails HABTM-添加和删除按钮（在“显示”视图上）

我正在显示一张发票，我想在其中添加“飞行”产品。我想使用产品的下拉框和添加按钮来完成这项工作。将产品添加到发票后，我希望能够单击删除按钮将其删除

我目前已经通过控制台完成了这项工作，但不确定如何在前端完成这项工作

如何设置：

用户模型：

class User < ActiveRecord::Base

....
has_many :invoices
....
end

class用户

发票型号：

class Invoice < ActiveRecord::Base
  attr_accessible :active
  validates :user_id, presence: true
  belongs_to :user

  has_many :categorizations
  has_many :flies, through: :categorizations
end

class发票

发票迁移：

class CreateInvoices < ActiveRecord::Migration
  def change
    create_table :invoices do |t|
      t.boolean :active
      t.integer :user_id

      t.timestamps
    end
    add_index :invoices, :user_id
  end

end

class CreateCategorizations < ActiveRecord::Migration
  def change
    create_table :categorizations do |t|
      t.integer :user_id
      t.integer :fly_id

      t.timestamps

      add_index :categorizations, :user_id
      add_index :categorizations, :fly_id
    end
  end
end

class CreateFlies < ActiveRecord::Migration
  def change
    create_table :flies do |t|
      t.string :name
      t.string :description

      t.timestamps
    end
  end
end

class CreateInvoices

分类模型：

class Categorization < ActiveRecord::Base
  attr_accessible :fly_id, :user_id

  belongs_to :invoice
  belongs_to :fly
end

类分类

分类迁移：

class CreateInvoices < ActiveRecord::Migration
  def change
    create_table :invoices do |t|
      t.boolean :active
      t.integer :user_id

      t.timestamps
    end
    add_index :invoices, :user_id
  end

end

class CreateCategorizations < ActiveRecord::Migration
  def change
    create_table :categorizations do |t|
      t.integer :user_id
      t.integer :fly_id

      t.timestamps

      add_index :categorizations, :user_id
      add_index :categorizations, :fly_id
    end
  end
end

class CreateFlies < ActiveRecord::Migration
  def change
    create_table :flies do |t|
      t.string :name
      t.string :description

      t.timestamps
    end
  end
end

class CreateCategorizations

飞行模型：

class Fly < ActiveRecord::Base
  attr_accessible :description, :name
  validates :description, :name, presence: true

  has_many :categorizations
  has_many :invoices, through: :categorizations
end

class Fly

快速迁移：

class CreateInvoices < ActiveRecord::Migration
  def change
    create_table :invoices do |t|
      t.boolean :active
      t.integer :user_id

      t.timestamps
    end
    add_index :invoices, :user_id
  end

end

class CreateCategorizations < ActiveRecord::Migration
  def change
    create_table :categorizations do |t|
      t.integer :user_id
      t.integer :fly_id

      t.timestamps

      add_index :categorizations, :user_id
      add_index :categorizations, :fly_id
    end
  end
end

class CreateFlies < ActiveRecord::Migration
  def change
    create_table :flies do |t|
      t.string :name
      t.string :description

      t.timestamps
    end
  end
end

class

显示发票视图：

<h3>Invoice</h3>
<p>User Name:
  <%= @invoice.user.name %></p>
<p>
  Invoice ID:
  <%= @invoice.id %></p>
<p>
  Invoice Active?:
  <%= check_box_tag 'admin', '1', @invoice.active, :disabled => true %></p>
<p>Email:
  <%= @invoice.user.email if @invoice.user.email %></p>
<table class="table table-condensed">
  <thead>
    <tr>
      <th>Invoice Flies</th>
    </thead>
    <tbody>
      <% @invoice.flies.each do |fly| %>
        <tr>
          <td><%= fly.name %></td>
        </tr>
      <% end %>
    </tbody>
  </table>

  <%= simple_form_for(@categorization) do |f| %>
      <%= render 'shared/error_messages', object: f.object %>

#this is where I want to add my 'add product to invoice' functionality


      <%= f.submit "Add Fly to Invoice", class: "btn btn-large btn-primary" %>
    <% end %>


  <%= button_to "Mark as Sent", {:controller => :invoices, :action => :activate, :id => @invoice.id }, {:method => :post } %>
<%= button_to "Mark as not sent", {:controller => :invoices, :action => :deactivate, :id => @invoice.id }, {:method => :post } %>
<br><br>
  <%= link_to "Back to list of invoices", invoices_path %>

发票
用户名：


发票ID:


发票激活？：
正确%>

电邮：

发票上的苍蝇
#这是我想添加“将产品添加到发票”功能的地方
：invoices，：action=>：activate，：id=>@invoices.id}，{:method=>：post}%>
：invoices，：action=>：deactivate，：id=>@invoices.id}，{:method=>：post}%>

有两个很好的宝石：